JP2008096076A - Stirling engine, regenerator for stirling engine, and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a Stirling engine capable of improving cooling efficiency. <P>SOLUTION: The Stirling engine 1 is provided with the regenerator 70 for a Stirling engine arranged in a gas passage with an annular cross section arranged between a compression space 45 and an expansion space 46 to exchange heat with working gas communicating through the gas passage. The regenerator 70 is formed by winding a band like film member 72 cut from a rolled web 8 many times over via an air gap, one side end of the film member 72 is cut by a vertical face 130 of a cutting edge 121 vertical to the film member 72, another side end is cut by a slanted face 129 of the cutting edge 121 slanted with respect to the film member 72, and a side of the regenerator 70 cut by the slanted face 129 is arranged in an expansion space 46 side. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a Stirling engine that constitutes a Stirling cycle. The present invention also relates to a Stirling engine, particularly a Stirling engine regenerator that is used in a Stirling refrigerator and transfers heat to and from a working gas, and a method for manufacturing the same.

  Since the Stirling engine uses helium, hydrogen, nitrogen or the like as the working gas and does not use Freon as the working gas, it attracts attention as a heat engine that does not cause destruction of the ozone layer. The Stirling engine has a piston and a displacer driven by a linear motor or the like, and the displacer reciprocates with a predetermined phase difference with respect to the reciprocating piston. As a result, the working gas flows between the compression space formed between the piston and the displacer and the expansion space formed at the tip of the displacer, and the Stirling cycle is operated.

  A gas passage having an annular cross section is formed around the cylinder in which the piston is fitted, and the working gas flows between the compression space and the expansion space via the gas passage. A regenerator that transfers heat to and from the working gas is provided in the gas passage, and heat exchangers that exchange heat with outside air are adjacent to both ends of the regenerator. In the compression space, the temperature of the working gas increases due to the isothermal compression change, and in the expansion space, the temperature of the working gas decreases due to the isothermal expansion change.

  The heat in the compression space is released into the atmosphere through a heat exchanger on the compression space side, and the working gas accumulates heat in a regenerator provided between the expansion space and the compression space and moves to the expansion space. The working gas cooled by the regenerator is further cooled by being expanded in the expansion space on the low temperature side, and takes the heat of the outside air through the heat exchanger on the expansion space side. Then, when the working gas moves from the expansion space to the compression space, the heat stored in the regenerator is taken and the regenerator is cooled. The Stirling cycle is performed by repeating this operation.

Patent Documents 1 and 2 disclose conventional regenerators. In this regenerator, a strip-shaped film member is wound around a cylindrical body in a multiple manner through a gap. The void is formed by a minute protrusion provided on the surface of the sheet member contacting an adjacent layer. The working gas flows axially in the gap and recovers heat by heat exchange with the film member.
Japanese Patent Laid-Open No. 2003-21212 (page 4, FIGS. 2, 3) Japanese Patent Laying-Open No. 2003-166442 (page 3 to page 6, FIG. 1)

  However, according to the above-mentioned conventional Stirling engine, when the film member forming the regenerator is cut, the stress remains, and when the temperature becomes high, the residual stress is released and the regenerator may be deformed. As a result, the pressure loss of the regenerator changes and there is a problem that the operating efficiency of the Stirling engine is lowered. Moreover, the film member before protrusion formation is wound in roll shape, and the film member after protrusion formation is wound again. For this reason, there was also a problem that the production cost of the regenerator was high.

  An object of this invention is to provide the Stirling engine which can improve cooling efficiency. Another object of the present invention is to provide a regenerator for a Stirling engine that can reduce costs and improve the operating efficiency of the Stirling engine, and a method for manufacturing the same.

  In order to achieve the above object, the present invention provides a Stirling that transfers heat to and from a working gas that is disposed in a gas passage having an annular cross section provided between a compression space and an expansion space and flows through the gas passage. In a Stirling engine equipped with an engine regenerator, the Stirling engine regenerator is formed by winding a strip-shaped film member cut from a raw fabric multiple times through a gap, and one side end of the film member is The cutting blade is cut by a vertical surface perpendicular to the film member, and the other side edge is cut by an inclined surface inclined with respect to the film member of the cutting blade, and the inclined surface of the Stirling engine regenerator It is characterized in that the side cut by the step is arranged on the expansion space side.

  According to this configuration, the Stirling engine regenerator disposed between the compression space and the expansion space is formed by winding a band-shaped film member having both side ends cut by a cutting blade. The cutting edge is sharply formed with a cutting edge having a vertical surface and an inclined surface, and cuts both side ends of the film member. At this time, one side end of the film member is cut by a vertical surface, and the other side end is cut by an inclined surface. And the side cut | disconnected by the inclined surface is distribute | arranged to the expansion space side.

  Further, the present invention is formed by wrapping a strip-shaped film member cut from a raw fabric multiple times through a gap, and in a gas passage having an annular cross section provided between a compression space and an expansion space of a Stirling engine. In the Stirling engine regenerator that is arranged and receives heat from the working gas flowing through the gas passage, one side end of the film member is cut by a vertical plane perpendicular to the film member of the cutting blade, The other side end is cut by an inclined surface inclined with respect to the film member of the cutting blade.

  According to the present invention, in the regenerator for a Stirling engine having the above-described configuration, a mark that can distinguish the side cut by the inclined surface is provided. According to this configuration, the side cut by the inclined surface of the cutting blade determined by the mark can be arranged on the expansion space side. The mark may be provided on the side cut by the inclined surface, or may be provided on the side cut by the vertical surface.

The present invention also relates to a regeneration for a Stirling engine that is arranged in a gas passage having an annular cross section provided between a compression space and an expansion space of the Stirling engine and transfers heat to and from the working gas flowing through the gas passage. In the manufacturing method of the vessel,
A cutting step of cutting a plurality of strip-shaped film members from the resin film original fabric by a plurality of cutting blades arranged in parallel;
A protrusion forming step of forming protrusions on the resin film original fabric or the film member;
A winding step of winding the film member on which the protrusion is formed around a cylindrical core;
The cutting edge of the cutting blade has a vertical surface perpendicular to the original film of the resin film and an inclined surface formed to be inclined with respect to the vertical surface, and is sharply formed, and the inclination of a plurality of the cutting blades The surface is arranged in parallel.

  According to this configuration, the resin film original is fed at a predetermined speed, and is cut by the plurality of strip-shaped film members by the plurality of cutting blades arranged in parallel in the direction perpendicular to the feed in the cutting process. The cut film member is formed with a number of protrusions by pressing the needle-like member in the protrusion forming step. You may form a processus | protrusion in the resin film original fabric before cutting. The film member on which the protrusion is formed is wound around the core in the winding process, and a regenerator for a Stirling engine is obtained in which the film member is wound in multiple layers with gaps due to the protrusion. The cutting blade used in the cutting process is sharply formed with a cutting edge having a vertical surface and an inclined surface, and the inclined surfaces of the cutting blades are arranged in parallel. Thereby, as for a film member, one side end is cut | disconnected by a vertical surface, and the other side end is cut | disconnected by an inclined surface.

  Further, the present invention is characterized in that in the method for manufacturing a regenerator for a Stirling engine having the above-described configuration, a mark adding step for adding a mark capable of distinguishing the side cut by the inclined surface of the wound film member is provided. .

  In the manufacturing method of the regenerator for a Stirling engine having the above-described configuration, the cutting step and the protrusion forming step are continuously performed while feeding the resin film and winding in the winding step. It is characterized by. According to this configuration, the resin film original fabric is wound after being cut and formed with protrusions while being pulled out by feeding.

  According to the Stirling engine of the present invention, since the Stirling engine regenerator wound with the film member cut by the cutting blade is disposed on the expansion space side on the side of the cutting blade, the film member is formed by the inclined surface. Even if stress remains, the residual stress is not released because it is maintained at a low temperature. Thereby, the change of the pressure loss by deformation | transformation of the regenerator for Stirling engines can be prevented, and high operating efficiency can be maintained.

  According to the Stirling engine regenerator of the present invention, the film member cut by the cutting blade has one side edge cut by the vertical surface of the cutting blade and the other side edge cut by the inclined surface. By arranging the side cut by the surface on the expansion space side of the Stirling engine, a Stirling engine with high operating efficiency can be obtained.

  Further, according to the regenerator for Stirling engine of the present invention, since the mark that can distinguish the side cut by the inclined surface is provided, the side cut by the inclined surface can be easily arranged on the expansion space side of the Stirling engine. .

  Further, according to the manufacturing method of the regenerator for Stirling engine of the present invention, since the cutting blade for cutting the resin film raw material is arranged in parallel with the inclined surface, one side end is cut by the vertical surface of the cutting blade. A plurality of film members having the other side edge cut by the inclined surface can be easily obtained.

  In addition, according to the method for manufacturing a regenerator for a Stirling engine of the present invention, since the mark adding step for attaching the mark for distinguishing the side cut by the inclined surface of the wound film member is provided, the side cut by the inclined surface Can be easily arranged on the expansion space side of the Stirling engine.

  Further, according to the manufacturing method of the regenerator for Stirling engine of the present invention, the cutting process and the protrusion forming process are continuously performed while feeding the resin film raw material and winding it in the winding process. Therefore, the manufacturing cost of the regenerator for Stirling engine can be reduced.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing the Stirling engine of the first embodiment. The Stirling engine 1 is a free piston type used as a refrigerator, and has cylinders 10 and 11 arranged in parallel in the axial direction. A piston 12 is inserted into the cylinder 10, and a displacer 13 is inserted into the cylinder 11. The piston 12 and the displacer 13 reciprocate without contacting the inner walls of the cylinders 10 and 11 during operation of the Stirling engine 1 by the gas bearings with the working gas filled in the cylinders 10 and 11.

  A cup-shaped magnet holder 14 is fixed to one end of the piston 12. A magnet 24 is attached to the opening end of the magnet holder 21. The cylinder 11 holds an outer yoke 22 and an inner yoke 23 that face the magnet 24. The tube body 25, the outer yoke 22 and the inner yoke 23 surrounding the outer yoke 22 are held in a predetermined positional relationship by synthetic resin end brackets 26 and 27. A coil 21 is wound around the outer yoke 22, and when the coil 21 is energized, the piston 12 integrated with the magnet 24 reciprocates. Thereby, the linear motor 20 which drives the piston 12 is comprised.

  A displacer shaft 15 projects from one end of the displacer 13. The displacer shaft 15 penetrates the piston 12 and the magnet holder 14 so that the displacer 13 can slide independently of the piston 12. The central portion of the leaf spring 31 is fixed to the displacer shaft 15, and the central portion of the leaf spring 30 is fixed to the magnet holder 14. The springs 30 and 31 are formed by making spiral cuts in a disk-shaped material. The outer peripheral portions of the leaf springs 30 and 31 are connected to each other at a predetermined interval via a spacer 32 and fixed to the end bracket 27.

  Accordingly, the displacer 13 reciprocates with a predetermined phase difference with respect to the piston 12 by the inertial force of the displacer 13. As a result, a compression space 45 for compressing the working gas is formed between the displacer 13 and the piston 12, and an expansion space 46 for expanding the working gas is formed at the tip of the displacer 13.

  A high temperature side heat transfer head 40 and a low temperature side heat transfer head 41 are disposed outside the portion of the cylinder 11 corresponding to the operation region of the displacer 13. The high temperature side heat transfer head 40 is formed in a ring shape, and the low temperature side heat transfer head 41 is formed in a cap shape. All are made of metal with good heat conductivity such as copper and copper alloy.

  Inside the high temperature side heat transfer head 40 and the low temperature side heat transfer head 41, a ring-shaped high temperature side internal heat exchanger 42 and a low temperature side internal heat exchanger 43 are mounted, respectively. Each of the high temperature side internal heat exchanger 42 and the low temperature side internal heat exchanger 43 has air permeability, and transfers the heat of the working gas passing through the inside to the high temperature side heat transfer head 40 and the low temperature side heat transfer head 41. The high temperature side internal heat exchanger 42 and the low temperature side internal heat exchanger 43 are formed, for example, by corrugating a copper or copper alloy thin plate and then compressing it.

  The high temperature side heat transfer head 40 and the low temperature side heat transfer head 41 are thus supported outside the cylinder 11 with the high temperature side internal heat exchanger 42 and the low temperature side internal heat exchanger 43 interposed therebetween. The cylinder 10 and the pressure vessel 50 are connected to the high temperature side heat transfer head 40.

  The compression space 45 includes an annular space surrounded by the high temperature side heat transfer head 40, the cylinders 10 and 11, the piston 12, the displacer 13, the displacer shaft 15, and the high temperature side internal heat exchanger 42. The expansion space 46 includes a space surrounded by the low temperature side heat transfer head 41, the cylinder 11, the displacer 13, and the low temperature side internal heat exchanger 43.

  A regenerator 70 is disposed between the high temperature side internal heat exchanger 42 and the low temperature side internal heat exchanger 43. A regenerator tube 48 wraps the outside of the regenerator 70 to form an airtight passage between the high temperature side heat transfer head 40 and the low temperature side heat transfer head 41. The regenerator tube 48 can be formed of stainless steel, for example.

  A cylindrical pressure vessel 50 that covers the linear motor 20, the cylinder 10, and the piston 12 is formed. The inside of the pressure vessel 50 becomes a back pressure space 51. The pressure vessel 50 is divided into two parts: a ring-shaped part 52 joined to the high temperature side heat transfer head 40 and a cap-shaped part 53 joined to the ring-shaped part 52. Both the ring-shaped part 52 and the cap-shaped part 53 are made of stainless steel. One end of the ring-shaped portion 52 is narrowed to a taper shape and brazed to the high temperature side heat transfer head 40. The cap-shaped part 53 has a structure in which an end plate 53a is welded to the inner surface of the pipe.

  Flange-shaped portions 54 and 55 are provided at the other end of the ring-shaped portion 52 and the open end of the cap-shaped portion 53 facing the ring-shaped portion 52. The flange-shaped portions 54 and 55 are both formed by welding a stainless steel ring to the ring-shaped portion 52 and the cap-shaped portion 53, and the flange-shaped portions 54 and 55 are welded to form a sealed pressure vessel. 50 is formed.

  The pressure vessel 50 is provided with a terminal portion 28 for supplying power to the linear motor 20 and a pipe 50a for enclosing a working gas therein. These are all provided so as to protrude in the radial direction from the outer peripheral surface of the cap-shaped portion 53.

  A vibration suppressing device 60 is attached to the pressure vessel 50. The vibration suppressing device 60 includes a base 61 fixed to the pressure vessel 50, a plate-like spring 62 supported by the base 61, and a balance weight 63 supported by the spring 62. When the piston 12 and the displacer 13 reciprocate to move the working gas, the Stirling engine 1 is vibrated. The vibration suppressing device 60 suppresses this vibration.

  In the Stirling engine 1 configured as described above, when an alternating current is supplied to the coil 21 of the linear motor 20, a magnetic field penetrating the magnet 24 is generated between the outer yoke 22 and the inner yoke 23. Thereby, the magnet 24 reciprocates in the axial direction. By supplying power with a frequency that matches the resonance frequency determined by the total mass of the piston system (piston 12, magnet holder 14, magnet 24, and spring 30) and the spring constant of the spring 30, the piston system is smooth. Start a sinusoidal reciprocating motion.

  The displacer system (displacer 13, displacer shaft 15, and spring 31) is set so that the resonance frequency determined by the total mass and the spring constant of the spring 31 resonates with the drive frequency of the piston 12.

  By the reciprocating motion of the piston 12, the compression space 45 is repeatedly compressed and expanded. As the pressure changes, the displacer 13 also reciprocates. At this time, a phase difference is generated between the displacer 13 and the piston 12 due to flow resistance between the compression space 45 and the expansion space 46. In this way, the displacer 13 having a free piston structure vibrates in synchronization with the piston 12 with a predetermined phase difference.

  By the above operation, an inverse Stirling cycle is formed between the compression space 45 and the expansion space 46. In the compression space 45, the temperature of the working gas increases, and in the expansion space 46, the temperature of the working gas decreases. The working gas that travels between the compression space 45 and the expansion space 46 during operation transfers heat to the high temperature side heat transfer head 40 as it passes through the high temperature side internal heat exchanger 42. Further, heat passes to the low temperature side heat transfer head 41 when passing through the low temperature side internal heat exchanger 43.

  Since the working gas flowing into the regenerator 70 from the compression space 45 is high temperature, the high temperature side heat transfer head 40 is heated, and the high temperature side heat transfer head 40 becomes a worm head. Since the working gas flowing into the regenerator 70 from the expansion space 46 is at a low temperature, the low temperature side heat transfer head 41 is cooled, and the low temperature side heat transfer head 41 becomes a cold head. The Stirling engine 1 functions as a refrigeration engine by dissipating heat from the high temperature side heat transfer head 40 to the atmosphere and lowering the temperature of the specific space with the low temperature side heat transfer head 41.

  The regenerator 70 functions to pass only the working gas without transferring the heat of the compression space 45 and the expansion space 46 to the counterpart space. The hot working gas that has entered the regenerator 70 from the compression space 45 through the high temperature side internal heat exchanger 42 gives the heat to the regenerator 70 when passing through the regenerator 70. Then, the working gas flows into the expansion space 46 with the temperature lowered. The low-temperature working gas that has entered the regenerator 70 from the expansion space 46 via the low-temperature side internal heat exchanger 43 recovers heat from the regenerator 70 when passing through the regenerator 70. Then, the working gas flows into the compression space 45 with the temperature raised. That is, the regenerator 70 serves as a heat storage means.

  FIG. 2 shows a cross-sectional view of the regenerator. The regenerator 70 has a cylindrical core 71, and a resin film winding laminate 73 in which a resin film member 72 is wound on the outer peripheral surface of the core 71 is provided. The winding core 71 has an inner diameter that is an interference fit with respect to the outer peripheral surface of the cylinder 11. The material of the core 71 may be anything as long as it can withstand the heat or cold caused by the working gas and can be used for a long time, but a synthetic resin is usually used in consideration of strength, heat insulation, manufacturing cost, and the like.

  In the figure, H is the compression space side when incorporated in the Stirling engine 1, and L is the expansion space side. The regenerator 70 is provided with a mark for distinguishing the compression space side and the expansion space side. The mark may be provided at one end in the axial direction, or may be provided at the center by an arrow or the like.

  FIG. 3 is a perspective view showing the resin film winding laminate 73. The film member 72 can be a film of polyethylene terephthalate (PET), polyimide, polystyrene, nylon, PTFE, PBT, or the like. PET is more preferable because it is inexpensive and has excellent performance as a regenerator.

  A large number of projections 74 are scattered on one surface of the film member 72. Thereby, the space | interval which lets a working gas pass between the layers of the resin film winding laminated body 73 is ensured. The protrusion 74 is formed by plastically deforming the film member 72 itself by a manufacturing method described later.

  FIG. 4 shows a regenerator forming apparatus that forms the regenerator 70. The regenerator forming apparatus 100 has a film feeder 113 and a film take-up device 116 at both ends. The raw film 8 of resin film is attached to the film feeder 113, and the core 71 is attached to the film winding device 116.

  As will be described later, the raw resin film 8 is cut into a plurality of strip-shaped film members 72 having a predetermined width, and is wound around the core 71 by a film winding device 116. Thereby, the winding process which winds the film member 72 is comprised. In addition, in order to draw a figure simply, although the film winding apparatus 116 has arranged the some core 71 in the straight line form, the core 71 is arrange | positioned alternately at steps. Thereby, interference between the adjacent winding cores 71 is prevented.

  Feed rollers 112 and 115 are disposed between the film feeder 113 and the film winding device 116. The feed rollers 112 and 115 each sandwich two film members 72 from above and below. Thereby, predetermined intermittent feed is given to the resin film original fabric 8 and the film member 72.

  A slitter device 120 is disposed downstream of the film feeder 113. The slitter device 120 includes a rotatable upper blade 121 and a lower blade 122. When the wide resin film raw fabric 8 passes between the upper blade 121 and the lower blade 122, the resin film raw fabric 8 is cut with a predetermined width. Thereby, the cutting process which cuts the resin film original fabric 8 and obtains a plurality of film members 72 is constituted.

  A projection forming device 101 is disposed at the rear stage of the slitter device 120. The projection forming apparatus 101 includes a platen 104 that supports the film member 72 from below, and a ram 103 that approaches the film member 72 supported by the platen 104 from above at a predetermined timing. A plurality of needle pins 102 project from the lower surface of the ram 103.

  The needle pins 102 are arranged in one or a plurality of rows in the direction orthogonal to the feeding direction of the film member 72 (one row in the figure). The platen 104 is provided with a hole (not shown) at a position corresponding to the needle pin 102. When the needle pin 102 is lowered, the film member 72 is pushed into the hole and the needle pin 102 penetrates the film member 72. To do.

  Thereby, the film member 72 is plastically deformed, and a large number of protrusions 74 are formed. Accordingly, a projection forming process for forming the projection 74 on the film member 72 is configured. In addition, the projection forming device 101 may be arranged in the front stage of the slitter device 120 to form the projection 74 on the resin film 8.

  The feed rollers 112 and 115 are arranged at the rear stage of the projection forming apparatus 101, and a leveling block 114 is arranged between them. The leveling block 114 is formed by arranging an upper block 114a and a lower block 114b facing each other at a predetermined interval. By passing the film member 72 after the projection is formed between the upper block 114a and the lower block 114b, the height of the projection 74 is made uniform. Thereby, the dispersion | variation in the interlayer space | interval of the resin film winding laminated body 73 can be made small.

  FIG. 5 is a front view showing a detailed configuration of the slitter device 120. The upper blade 121 (cutting blade) includes an upper blade rotating shaft 123, a plurality of blade bases 124 provided on the upper blade rotating shaft 123, and an upper single blade 125. The lower blade 122 includes a lower blade rotating shaft 126, a plurality of blade tables 127 provided on the lower blade rotating shaft 126, and a lower single blade 128.

  The cutting edge of the upper single blade 125 has a vertical portion 130 perpendicular to the film member 72 and an inclined portion 129 that is inclined with respect to the vertical portion 130 and is sharply formed. Further, the inclined portions 129 of the plurality of upper single blades 125 are arranged in parallel. The cutting edge of the lower blade 128 slides with the vertical portion 130 of the upper blade 125, and the tip is a flat surface substantially parallel to the film member 72. With such a configuration, the resin film original 8 is cut by the upper blade 121 and the lower blade 122 to be a film member 72 cut to a predetermined width.

  FIG. 6 is a schematic diagram showing the relationship between the slitter device 120 and the film winding device 116. In order to facilitate understanding, other configurations such as a protrusion forming portion are omitted. The film member 72 cut by the upper blade 121 and the lower blade 122 is wound around the core 71 by the film winding device 116. At this time, the film member 72 is wound so that the side cut by the inclined portion 129 of the upper blade is the L side of the core 71, and the side cut by the vertical portion 130 of the upper blade is the H side of the core 71. It is done. Marks (not shown) are added to the H side and the L side of the core 71 by a mark adding process.

  In the regenerator 70 thus formed, the H side of the core is disposed on the compression space 45 side shown in FIG. 1 and the L side is disposed on the expansion space 46 side. Thereby, as will be described later, the Stirling engine 1 can obtain stable performance with little performance deterioration even when used for a long time.

  FIG. 7 is a diagram showing details when the film member 72 is cut. As shown in the figure, the end portion 91 of the film member 72 cut by the inclined portion 129 of the upper single blade 125 has a larger residual stress 140 than the side cut by the vertical portion 130 (indicated by hatching in the drawing). Will occur. When this end 91 is exposed to a high temperature on the compression space 45 side, it is released from residual stress, and deformation such as wrinkles occurs at the end.

  For this reason, when the H side and the L side of the regenerator 70 are reversed and incorporated in the Stirling engine, the variation in the layer interval of the resin film laminate 73 increases due to the deformation of the film member 72. As a result, the working gas does not uniformly pass through the regenerator 79, the pressure loss changes, and the heat exchange performance between the regenerator 70 and the working gas is lowered.

  For example, when the variation in the layer spacing increases, the working gas flows more in the portion where the layer spacing of the resin film laminate 73 is larger, and the working gas does not flow easily in the portion where the layer spacing is smaller. As a result, heat exchange cannot be effectively performed in the entire regenerator 70, and heat exchange performance is reduced. Therefore, the cooling performance of this Stirling engine deteriorates with time.

  In general, in the Stirling engine 1 shown in the present embodiment, there is an appropriate value for the pressure loss when the working gas passes through the regenerator 70. If the pressure loss deviates from this appropriate value, the piston 12 and the displacer 13 The phase difference changes from a predetermined value and the performance deteriorates. Therefore, when the pressure loss changes, the performance of the Stirling engine 1 is deteriorated. In addition, the deterioration of the heat exchange performance between the regenerator 70 and the working gas increases the regeneration heat loss of the Stirling cycle, which also causes the performance deterioration.

  Therefore, performance degradation is prevented by cutting the regenerator 70 having a large residual stress of the film member 72 on the low temperature expansion space 46 side by cutting at the inclined portion 129 of the upper blade 121 as in this embodiment. can do.

  According to the present embodiment, the regenerator 70 wound with the film member 72 cut by the upper blade 121 and the lower blade 122 is disposed on the expansion space 46 side on the side cut by the inclined surface 129 of the upper blade 121. Even if stress remains in the film member 72 due to the inclined surface 129, the residual stress is not released because it is maintained at a low temperature. Thereby, the change of the pressure loss by deformation | transformation of the regenerator 70 can be prevented, and high operating efficiency can be maintained.

  Also, since the plurality of upper blades 121 for cutting the resin film 8 are arranged in parallel with the inclined surface 129, one side end is cut by the vertical surface 130 of the upper blade 121, and the other side end is inclined. A plurality of film members 72 cut along the surface 129 can be easily obtained.

  In addition, since the raw material film 8 is sent out by the regenerator forming apparatus 100 and wound in the winding process, the cutting process and the protrusion forming process are continuously performed, so there is no need to wind after cutting, and the regenerator The manufacturing cost of 70 can be reduced.

  Although the embodiments of the present invention have been described above, various modifications can be made without departing from the spirit of the invention. For example, in the present embodiment, the slit device 120 is cut by the upper blade 121 and the lower blade 122, but is not limited thereto. For example, it is obvious that the same effect can be obtained by any cutting method such as a cutting blade having an inclined surface like a cutting edge of a cutter.

  In the present embodiment, the cutting method of the film member 72 is described as the presence or absence of residual stress depending on whether or not the cutting edge is inclined. However, the substantial residual stress generated when cutting is not zero. Therefore, the effect of the present invention can be interpreted as having the same meaning as providing the higher residual stress generated at the end of the film member 72 on the expansion side of the Stirling engine by cutting. It is also possible to intentionally cut the film so that there is a side where the residual stress is high and a side where the residual stress is low when the film member is cut, and the higher residual stress is provided on the expansion side of the Stirling engine.

  Further, in this embodiment, an example of consistently creating from a raw resin film to a winding core for mass production is shown, but the same effect can be obtained when manufacturing by dividing into each process. It is clear.

  INDUSTRIAL APPLICABILITY The present invention can be used for refrigeration equipment using a Stirling cycle in particular for Stirling engines.

Sectional drawing which shows the Stirling engine of embodiment of this invention Sectional drawing which shows the regenerator of the Stirling engine of embodiment of this invention The perspective view which shows the resin film winding laminated body of the Stirling engine of embodiment of this invention Schematic which shows the regenerator formation apparatus of the Stirling engine of embodiment of this invention. The schematic front view which shows the slitter apparatus of the regenerator formation apparatus of the Stirling engine of embodiment of this invention Schematic which shows the positional relationship of the slitter apparatus and winding-up apparatus of the regenerator forming apparatus of the Stirling engine of embodiment of this invention. The figure which shows the detail at the time of the cutting | disconnection of the regenerator forming apparatus of the Stirling engine of embodiment of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stirling engine 8 Film resin raw material 10, 11 Cylinder 12 Piston 13 Displacer 20 Linear motor 40 High temperature side heat transfer head 41 Low temperature side heat transfer head 45 Compression space 46 Expansion space 70 Regenerator 71 Core 72 Film member 73 Resin film winding Rotating laminated body 74 Protrusion 100 Regenerator forming device 101 Protrusion forming device 113 Film feeder 120 Slitter device 121 Upper blade 122 Lower blade 116 Winding device

Claims (6)

  In a Stirling engine equipped with a regenerator for Stirling engine that is arranged in a gas passage having an annular cross section provided between a compression space and an expansion space and transfers heat to and from the working gas flowing through the gas passage, The regenerator for the Stirling engine is formed by winding a strip-shaped film member cut from a raw material multiple times through a gap, and one side end of the film member is a vertical surface perpendicular to the film member of a cutting blade The other side end is cut by an inclined surface inclined with respect to the film member of the cutting blade, and the side cut by the inclined surface of the Stirling engine regenerator is disposed on the expansion space side. Stirling organization characterized by that.   It is formed by winding a strip-shaped film member cut from a raw material through a gap, and is disposed in a gas passage having an annular cross section provided between a compression space and an expansion space of a Stirling engine. In the Stirling engine regenerator that transfers heat to and from the working gas flowing through the passage, one side end of the film member is cut by a vertical plane perpendicular to the film member of the cutting blade, and the other side end is A regenerator for a Stirling engine, wherein the regenerator is cut by an inclined surface inclined with respect to the film member of the cutting blade.   The regenerator for a Stirling engine according to claim 2, wherein a mark capable of distinguishing the side cut by the inclined surface is provided. In a method of manufacturing a regenerator for a Stirling engine, which is arranged in a gas passage having an annular cross section provided between a compression space and an expansion space of a Stirling engine and transfers heat to and from a working gas flowing through the gas passage. ,
A cutting step of cutting a plurality of strip-shaped film members from the resin film original fabric by a plurality of cutting blades arranged in parallel;
A protrusion forming step of forming protrusions on the resin film original fabric or the film member;
A winding step of winding the film member on which the protrusion is formed around a cylindrical core;
The cutting edge of the cutting blade has a vertical surface perpendicular to the original film of the resin film and an inclined surface formed to be inclined with respect to the vertical surface, and is sharply formed, and the inclination of a plurality of the cutting blades A method of manufacturing a regenerator for a Stirling engine, wherein the surfaces are arranged in parallel.   5. The method of manufacturing a regenerator for a Stirling engine according to claim 4, further comprising a mark adding step for providing a mark for distinguishing a side of the wound film member cut by the inclined surface.   The Stirling engine according to claim 4 or 5, wherein the cutting step and the protrusion forming step are continuously performed while feeding the resin film original and winding in the winding step. A method for manufacturing a regenerator.

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